C#使用命名空间

using System;

namespace first_space {

   class namespace_cl {

      public void func() {
         Console.WriteLine("Inside first_space");
      }
   }
}

namespace second_space {

   class namespace_cl {

      public void func() {
         Console.WriteLine("Inside second_space");
      }
   }
}

class TestClass {

   static void Main(string[] args) {
      first_space.namespace_cl fc = new first_space.namespace_cl();
      second_space.namespace_cl sc = new second_space.namespace_cl();
      fc.func();
      sc.func();
      Console.ReadKey();
   }
}